Performance

Both hooks solve the same problem — keeping a UI responsive during expensive state updates. One works better for immediate input feedback. The other suits data-heavy renders. This comparison test walks through the difference.

HTTP caching, memoization, and service workers each solve a different performance problem. Here is what each approach can and cannot do for a React app, based on measured results.

The Performance tab gives you a frame-by-frame record of exactly where your React components draw. Here is the workflow for turning that raw trace into a targeted fix.

Context is the easiest way to share state, but also the easiest way to cause wasteful re-renders. Here are the five most effective selector patterns, ranked from simplest to most powerful.

Streaming SSR and traditional SSR both produce server-rendered HTML. The difference is in when the bytes arrive—and that timing gap matters more than most benchmarks show. Here is what changes in practice.

Inline functions and objects in JSX are convenient, but they create new references on every render. Here is what the profiler shows when you measure the cost.

Lazy loading with Intersection Observer is straightforward in theory, but several common implementation mistakes silently break it. Here is a symptom-based checklist to diagnose and fix them.

Infinite scroll in React consistently degrades performance when list items grow without bound. This post answers the real questions: intersection observers, virtualization, pagination internals, and strategies for browser memory throttling.

By the end of this guide you'll know how to eliminate loading spinners caused by late data or resource fetching, using techniques ranging from basic link hints to advanced route-level prefetching.

React 19 introduced several features marketed as performance wins. Testing shows some deliver measurable gains while others mostly simplify code. Here is the breakdown.